Work feed device for grinding machines



Aug. 24, 1954 A. s. wYBoRsKl WORK FEED DEVICE FOR GRINDING lMACHINESFiled llo'ct. 1o, 1952 Patented Aug. 24, 1954 aan WORK FEED DEVICE FORGRINDING MACHINES Aloysius S. Wyborski, Grosse Pointe Park, Mich.,

assignor to Peninsular Grinding Wheel Co., iDetroit, Mich., acorporation of Michigan Application October 10, 1952, Serial No. 314,081

6 Claims. 1

This invention relates to a work-feed device and more particularly to aWork-feed device for iie with floor stand grinding machines and the Theusual practice in the foundry industry is to remove sprues, ns or otherprojections on castings by the use of floor stand grinding machines,commonly known as snagging machines. In the grinding or snaggingoperation, the casting workpiece is manually presented to the grindingWheel by the operator and is supported on a rest or stand adjacent thewheel while being ground. In order to increase the grinding pressure,some operators use manual devices of various types to obtain leveragebut such practices are fatiguing since the required force must beprovided by the operator.

Prior devices have also been used which permit the operator to multiplythe leverage by stepping on a foot pedal. While such devices make thework somewhat easier and reduce operator fatigue, they are subject tothe defect that the operator must spend most of his production time onone foot and he is still required to provide the force.

Accordingly, an object of the present invention is to overcome thedisadvantages present With devices of the type above referred to and toprovide a work-feed device for use with grinding machines having meanswhich obviates the necessity of the operator to provide the requiredgrinding pressure.

Another object of the invention is to increase the production rate ofsnagging operations by increasing the grinding pressure and reducingoperator fatigue.

Another object of the invention is to obtain greater grinding Wheeleconomy by permitting the use of harder grades of grinding wheels.

Yet another object of the invention is to provide a work-feed devicewhich may be readily adapted to accommodate workpieces of various sizesand shapes.

Still another object of the invention is to provide a work-feed devicewhich is simple in con-- struction, economical of manufacture, durableand reliable in operation and which enables rapid quantity snagging ofcastings at a minimumof expense.

The above, as well other and in certain cases more detailed objects willbecome anparent from the following description and the appended claims.A preferred, but illustrative, embodiment oi the invention isillustrated in the accompanying drawing throughout the several views ofwhich corresponding reference characters designate corresponding partsand wherein:

Figure 1 is a side elevational view of the invention with portions insection and other portions broken away;

Figure 2 is a iront elevational View with portions in section; and,

Figure 3 is a perspective view showing a workpiece applied to aconventional grinding Wheel,

Referring to the drawing, there is illustrated a device of theabove-described type having a horizontally disposed base plate l0 whichmay be bolted or otherwise secured to the oor adjacent a grindingmachine, and having upwardly extending outwardly inclined legs in theform of angle pieces such as I2, lli, and It. The lower end portions ofthe legs are welded or otherwise rigidly secured to the corner portionsof the base plate I t and the upper end portions abut and are rigidlysecured to the corner portions of a support plate 2t by suitableattachment means, such as welding or the like, the support plate 2Bbeing adapted to support a casting workpiece.

A pair of spaced parallel forwardly extending angle pieces 22 and 2liare secured by bolts, such as l23 and 25, to the lower side of plate 2t,with the flange portions 2t and 28 projecting inwardly so as to definehorizontal ways on which are slidably mounted a carrier plate 3u.Carrier plate 3b may be releasably secured in a selected adjustedposition by means of a bolt t2 which passes through a slot 34 providedin the angle piece 2li and is threadably ntted in a suitable openingprovided in the side of the carrier plate.

For the purpose of applying grinding pressure to a casting workpiece, abell crank 36 is provided, the upper end portion of which eX- tendsupwardly through suitable centrally disposed aligned slots provided inthe carrier plate and support plate 2R. A horizontally extendingpressure bar i8 is welded or otherwise secured to the forward edge ofthe upper end portion of bell crank 35i. Bell crank 36 is pivotallymounted on pivot pin iii! which is supported in suitable bearing blockst2 and @ci secured to the lower side of carrier plate 3i) by bolts suchas 45.

Most foundries make castings of various sizes and shapes and it will beappreciated from the above description that rapid adjustments may bemade to accommodate the various castings by moving the carrier plate 36forwardly or backwardly in the ways dened by the angle pieces 22 and '24so that the pressure bar 38 may be positioned near the rear surface of acasting workpiece with s'uicient clearance being provided to facilitateinsertion and removal of the workpiece.

As best seen in Figure 2, lubricating grease may be applied to lubricatethe bell crank through a conventional grease fitting 46 threadablyfitted in the outer end of an axial duct 48 which extends partiallythrough the pivot pin 40. The grease flows through duct 48 andcommunicating, radially extending ducts 56 and 52, to the surface of thepivot pin.

A cylinder 54 of conventional design is provided having an internallyreciprocative piston 56 integrally attached to the lower end portion ofa rod 58. The upper end portion of the rod 58 is pivotally connected tothe lower end portion of bell crank 36 by pin 60 which is rotatablymounted in extension members 62 and 64 integrally attached to the bellcrank, as by welding or the like, and extending rearwardly therefrom.

For the purpose of pivotally connecting the cylinder 54 to the baseplate I6, the lower end portion of cylinder 54 is provided withdownwardly projecting flanges 66 and 68 adapted t'o accommodate a pivotpin 'lil which passes through an upwardly extending block 'i2 attachedto base plate l l). It will be appreciated that such a constructionpermits the cylinder to pivot forwardly or backwardly about the pin 1lias the carrier plate is moved forwardly or backwardly in thepreviously-mentioned horizontal ways.

The piston 56 is actuated by air or fluid supplied under pressure to thelower end portion of 'the cylinder 54 through flexible tube 'i4 and asupply line 16 connected to a suitable source (not shown). The pressureis controlled by a conventional foot actuated valve 16 which isinterposed between flexible tube 14 and the supply line 16 and issecured to the rear edge of the base l by screws 8D and 82.

It will be appreciated that the above arrangement obviates the necessityof the operator tosupply the force necessary to obtain adequate grindingpressure, thereby substantially reducing operator fatigue. The abovearrangement also permits the use of harder grades of grinding wheels toeffect greater wheel economy and permits the product-ion rate ofsnagging operations to be increased by providing a higher grindingpressure than is obtainable when it is necessary for the operator tosupply the force.

In the operation of the device to grind castings, the workpiece 84 isinterposed between the conventional grinding wheel 86 and the pressurebar 38, as illustrated in Figure 3, and supported 'on plate 20. Aspreviously mentioned the carrier plate 36 may be moved forwardly orbackwardly so that castings of various sizes may be accommodated. Theoperator then actuates the valve 'I8 so that air or uid is admittedunder pressure through the supply line 'it and flexible tube 'M to thelower portion of the cylinder J54. The pisvton 56 and the attached rod58 are then moved upwardly causing the bell crank 36 to rock forwardlyso that the pressure is transmitted through the pressure bar 36 to thecasting and forces the casting against the grinding wheel.

While a preferred embodiment of the invention has been shown anddescribed it will, of course, be understood that various changes andmodifications may be made without departing from the scope and spirit ofthe invention.

What is claimed is:

1. A work-feed device for use with grinding machines comprising asupport plate, elongate guides carried by said support plate, a carriermember slidably mounted in said guides, means for releasably lockingsaid carrier member in a selected adjusted position, a bell crankextending through aligned slots in said carrier member and said supportplate and pivotally attached to said carrier member, a ypressure bar xedto one end portion of said bell crank, a rod pivotally attached to theother end portion of said bell crank, a cylinder, and a pistonreciprocatively mounted in said cylinder and integrally attached to saidrod.

2. A work-feed device for use with grinding machines comprising a fiatplate, elongate guides xed to said plate, means for supporting saidplate, a carrier member slidably mounted in said guides adjacent thelower side of said flat plate, means for releasably locking said carriermember in a selected adjusted position, a bell crank pivotally attachedto said carrier member, one end portion of said crank extending throughaligned slots in said carrier member and said plate, a pressure barfixed to said one end portion of said bell crank, a rod pivotallyattached to the other end portion of said bell crank, a cylinderpivotally attached to said plate supporting means and a pistonreciproca-tively mounted in said cylinder and integrally attached tolsaid rod.

3. A work-feed device for use with snagging machines comprising ahorizontal plate adapted to support a workpiece thereon, a pair ofhorizontal ways secured to the lower side of said plate, a carriermember slidably mounted on said ways, a bell crank pivotally attached tothe lower side of said carrier member, one end portion of said bellcrank extending upwardly through centrally disposed, aligned slots insaid carrier member and said plate, said upwardly extending portionhaving a pressure bar integrally attached to the forward edge thereof, arod pivotally connected to the other end portion of said bell crank, acylinder, and a piston iny said cylinder integrally attached to saidrod.

4. A work-feed device for use with snagging machines comprising asubstantially rectangular base having upwardly extending legs integrallyattached to the corner portions thereof, a horizontal plate integrallyattached to the upper end 'port-ions of said legs, a pair of horizontalangle pieces secured to the lower side of said plate, a carrier memberslidably mounted on said angle pieces, means for releasably securingsaid carrier member in a selected adjusted position, a bell crankpivotally attached to said carrier member, said plate and said carriermember provided with centrally disposed aligned slots adapted toaccommodate the forward portion of said bell crank, a pressure barsecured to the forward edge of said forward portion, a rod pivotallyconnected to the rearward portion of said bell crank, a cylinder, apiston in said cylinder connected to said rod, and means for selectivelyadmitting a fluid to .said cylinder under pressure.

5. A work-feed device for use with snagging machines comprising asubstantially rectangular base having upwardly extending outwardlyinclined legs secured to the corner portions thereof, a horizontal platesecured to the upper portions of said legs, a pair of horizontal anglepieces secured to the lower side of said plate so as to definehorizontal Ways, a carrierr member slidably mounted on said ways, meansfor releasably securing said carrier member in a selected adjustedposition, a bell crank pivotally attached to said carrier member, saidplate and said carrier member provided with centrally disposed alignedslots adapted to accommodate the forward portion of said bell crank, apressure bar secured to the forward edge of said forward portion, a rodpivotally connected toi the rearward portion of said bell crank, acylinder pivotally attached to said base, a piston slidably mounted insaid cylinder and connected to said rod, and means for selectivelyadmitting a fluid to said cylinder under pressure.

6. A work-feed device for use with snagging machines comprising a basehaving upwardly extending outwardly inclined legs secured to the cornerportions thereof, a horizontal plate secured to the upper portions ofsaid legs, a pair of angle pieces secured to the lower side of saidplate, a carrier member slidably mounted on said angle pieces, means forreleasably securing said carrier member in a selected adjusted position,abell crank pivotally attached to said carrier member, a pressure barsecured to the forward edge of said bell crank, a pair of extensionmembers integrally attached to the rear portion of said bell crank onopposite sides thereof, a rod pivotally connected to said extensionmembers, a cylinder pivotally connected to said base, and areciprocative piston in said cylinder secured to said rod, and valvemeans for selectively admitting a fluid to said cylinder under pressure.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 565,644 Taylor Aug, 11, 1896 20 1,826,445 Balsiger Oct. 6,1931 2,371,085 Waters Mar. 6, 1945

